Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / whidbey / netfxsp / ndp / fx / src / xsp / System / Web / AspNetSynchronizationContext.cs / 5 / AspNetSynchronizationContext.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- using System; using System.ComponentModel; using System.Security.Permissions; using System.Threading; using System.Web; using System.Web.Util; namespace System.Web { internal class AspNetSynchronizationContext : SynchronizationContext { private HttpApplication _application; private bool _disabled; private bool _syncCaller; private bool _invalidOperationEncountered; private int _pendingCount; private Exception _error; private WaitCallback _lastCompletionWorkItemCallback; internal AspNetSynchronizationContext(HttpApplication app) { _application = app; } private void CallCallback(SendOrPostCallback callback, Object state) { // don't take app lock for [....] caller to avoid deadlocks in case they poll for result if (_syncCaller) { CallCallbackPossiblyUnderLock(callback, state); } else { lock (_application) { CallCallbackPossiblyUnderLock(callback, state); } } } private void CallCallbackPossiblyUnderLock(SendOrPostCallback callback, Object state) { HttpApplication.ThreadContext threadContext = null; try { threadContext = _application.OnThreadEnter(); try { callback(state); } catch (Exception e) { _error = e; } } finally { if (threadContext != null) { threadContext.Leave(); } } } internal int PendingOperationsCount { get { return _pendingCount; } } internal Exception Error { get { return _error; } } internal void ClearError() { _error = null; } internal void SetLastCompletionWorkItem(WaitCallback callback) { Debug.Assert(_lastCompletionWorkItemCallback == null); // only one at a time _lastCompletionWorkItemCallback = callback; } public override void Send(SendOrPostCallback callback, Object state) { #if DBG Debug.Trace("Async", "Send"); Debug.Trace("AsyncStack", "Send from:\r\n" + System.Environment.StackTrace); #endif CallCallback(callback, state); } public override void Post(SendOrPostCallback callback, Object state) { #if DBG Debug.Trace("Async", "Post"); Debug.Trace("AsyncStack", "Post from:\r\n" + System.Environment.StackTrace); #endif CallCallback(callback, state); } #if DBG [EnvironmentPermission(SecurityAction.Assert, Unrestricted=true)] private void CreateCopyDumpStack() { Debug.Trace("Async", "CreateCopy"); Debug.Trace("AsyncStack", "CreateCopy from:\r\n" + System.Environment.StackTrace); } #endif public override SynchronizationContext CreateCopy() { #if DBG CreateCopyDumpStack(); #endif AspNetSynchronizationContext context = new AspNetSynchronizationContext(_application); context._disabled = _disabled; context._syncCaller = _syncCaller; return context; } public override void OperationStarted() { if (_invalidOperationEncountered || (_disabled && _pendingCount == 0)) { _invalidOperationEncountered = true; throw new InvalidOperationException(SR.GetString(SR.Async_operation_disabled)); } Interlocked.Increment(ref _pendingCount); #if DBG Debug.Trace("Async", "OperationStarted(count=" + _pendingCount + ")"); Debug.Trace("AsyncStack", "OperationStarted(count=" + _pendingCount + ") from:\r\n" + System.Environment.StackTrace); #endif } public override void OperationCompleted() { if (_invalidOperationEncountered || (_disabled && _pendingCount == 0)) { // throw from operation started could cause extra operation completed return; } bool lastOperationCompleted = (Interlocked.Decrement(ref _pendingCount) == 0); #if DBG Debug.Trace("Async", "OperationCompleted(count=" + _pendingCount + ")"); Debug.Trace("AsyncStack", "OperationCompleted(count=" + _pendingCount + ") from:\r\n" + System.Environment.StackTrace); #endif if (lastOperationCompleted && _lastCompletionWorkItemCallback != null) { // notify (once) about the last completion to resume the async work WaitCallback cb = _lastCompletionWorkItemCallback; _lastCompletionWorkItemCallback = null; Debug.Trace("Async", "Queueing LastCompletionWorkItemCallback"); ThreadPool.QueueUserWorkItem(cb); } } internal bool Enabled { get { return !_disabled; } } internal void Enable() { _disabled = false; } internal void Disable() { _disabled = true; } internal void SetSyncCaller() { _syncCaller = true; } internal void ResetSyncCaller() { _syncCaller = false; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- using System; using System.ComponentModel; using System.Security.Permissions; using System.Threading; using System.Web; using System.Web.Util; namespace System.Web { internal class AspNetSynchronizationContext : SynchronizationContext { private HttpApplication _application; private bool _disabled; private bool _syncCaller; private bool _invalidOperationEncountered; private int _pendingCount; private Exception _error; private WaitCallback _lastCompletionWorkItemCallback; internal AspNetSynchronizationContext(HttpApplication app) { _application = app; } private void CallCallback(SendOrPostCallback callback, Object state) { // don't take app lock for [....] caller to avoid deadlocks in case they poll for result if (_syncCaller) { CallCallbackPossiblyUnderLock(callback, state); } else { lock (_application) { CallCallbackPossiblyUnderLock(callback, state); } } } private void CallCallbackPossiblyUnderLock(SendOrPostCallback callback, Object state) { HttpApplication.ThreadContext threadContext = null; try { threadContext = _application.OnThreadEnter(); try { callback(state); } catch (Exception e) { _error = e; } } finally { if (threadContext != null) { threadContext.Leave(); } } } internal int PendingOperationsCount { get { return _pendingCount; } } internal Exception Error { get { return _error; } } internal void ClearError() { _error = null; } internal void SetLastCompletionWorkItem(WaitCallback callback) { Debug.Assert(_lastCompletionWorkItemCallback == null); // only one at a time _lastCompletionWorkItemCallback = callback; } public override void Send(SendOrPostCallback callback, Object state) { #if DBG Debug.Trace("Async", "Send"); Debug.Trace("AsyncStack", "Send from:\r\n" + System.Environment.StackTrace); #endif CallCallback(callback, state); } public override void Post(SendOrPostCallback callback, Object state) { #if DBG Debug.Trace("Async", "Post"); Debug.Trace("AsyncStack", "Post from:\r\n" + System.Environment.StackTrace); #endif CallCallback(callback, state); } #if DBG [EnvironmentPermission(SecurityAction.Assert, Unrestricted=true)] private void CreateCopyDumpStack() { Debug.Trace("Async", "CreateCopy"); Debug.Trace("AsyncStack", "CreateCopy from:\r\n" + System.Environment.StackTrace); } #endif public override SynchronizationContext CreateCopy() { #if DBG CreateCopyDumpStack(); #endif AspNetSynchronizationContext context = new AspNetSynchronizationContext(_application); context._disabled = _disabled; context._syncCaller = _syncCaller; return context; } public override void OperationStarted() { if (_invalidOperationEncountered || (_disabled && _pendingCount == 0)) { _invalidOperationEncountered = true; throw new InvalidOperationException(SR.GetString(SR.Async_operation_disabled)); } Interlocked.Increment(ref _pendingCount); #if DBG Debug.Trace("Async", "OperationStarted(count=" + _pendingCount + ")"); Debug.Trace("AsyncStack", "OperationStarted(count=" + _pendingCount + ") from:\r\n" + System.Environment.StackTrace); #endif } public override void OperationCompleted() { if (_invalidOperationEncountered || (_disabled && _pendingCount == 0)) { // throw from operation started could cause extra operation completed return; } bool lastOperationCompleted = (Interlocked.Decrement(ref _pendingCount) == 0); #if DBG Debug.Trace("Async", "OperationCompleted(count=" + _pendingCount + ")"); Debug.Trace("AsyncStack", "OperationCompleted(count=" + _pendingCount + ") from:\r\n" + System.Environment.StackTrace); #endif if (lastOperationCompleted && _lastCompletionWorkItemCallback != null) { // notify (once) about the last completion to resume the async work WaitCallback cb = _lastCompletionWorkItemCallback; _lastCompletionWorkItemCallback = null; Debug.Trace("Async", "Queueing LastCompletionWorkItemCallback"); ThreadPool.QueueUserWorkItem(cb); } } internal bool Enabled { get { return !_disabled; } } internal void Enable() { _disabled = false; } internal void Disable() { _disabled = true; } internal void SetSyncCaller() { _syncCaller = true; } internal void ResetSyncCaller() { _syncCaller = false; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- ReflectionPermission.cs
- DataTableTypeConverter.cs
- SQLBoolean.cs
- StringAttributeCollection.cs
- ContentFileHelper.cs
- IteratorDescriptor.cs
- HttpModuleCollection.cs
- ReadOnlyDataSource.cs
- XhtmlBasicValidatorAdapter.cs
- SafeLocalAllocation.cs
- SystemMulticastIPAddressInformation.cs
- WindowsScrollBarBits.cs
- ConstraintStruct.cs
- InvalidateEvent.cs
- ProcessStartInfo.cs
- Set.cs
- DebugControllerThread.cs
- FontCacheUtil.cs
- Int32KeyFrameCollection.cs
- IsolationInterop.cs
- FixedSOMTableCell.cs
- ActivityMarkupSerializer.cs
- FontStretches.cs
- FamilyMap.cs
- comcontractssection.cs
- SchemaManager.cs
- FixedPageStructure.cs
- PermissionSetTriple.cs
- TwoPhaseCommitProxy.cs
- ListSortDescriptionCollection.cs
- OptimalTextSource.cs
- MachineKeyConverter.cs
- EntityDesignerUtils.cs
- PlaceHolder.cs
- MessageSecurityVersion.cs
- JsonClassDataContract.cs
- SoundPlayerAction.cs
- UIElementIsland.cs
- XmlTextReaderImplHelpers.cs
- ChangeBlockUndoRecord.cs
- WebPartsPersonalizationAuthorization.cs
- SymbolPair.cs
- QueryReaderSettings.cs
- DocumentStream.cs
- FlagPanel.cs
- EntityCommandDefinition.cs
- Base64Stream.cs
- OdbcStatementHandle.cs
- EntityCommandDefinition.cs
- GroupPartitionExpr.cs
- EventsTab.cs
- EntitySqlException.cs
- QueryOutputWriter.cs
- CharUnicodeInfo.cs
- InteropDesigner.xaml.cs
- ChannelPool.cs
- BindUriHelper.cs
- QEncodedStream.cs
- NonSerializedAttribute.cs
- MobileUserControlDesigner.cs
- ToolStripContextMenu.cs
- OleDbCommand.cs
- PbrsForward.cs
- PeerCollaborationPermission.cs
- SQLMembershipProvider.cs
- WebConvert.cs
- Brush.cs
- QilBinary.cs
- InvalidPrinterException.cs
- NavigationProgressEventArgs.cs
- XmlSchemaParticle.cs
- HandleRef.cs
- StyleSelector.cs
- ToolStripProgressBar.cs
- FixedSOMTextRun.cs
- TreeIterator.cs
- MetadataWorkspace.cs
- SubtreeProcessor.cs
- SectionRecord.cs
- AuthenticationService.cs
- TextParagraphView.cs
- UpWmlPageAdapter.cs
- HwndHostAutomationPeer.cs
- RC2.cs
- DrawingContextDrawingContextWalker.cs
- Context.cs
- TransformBlockRequest.cs
- ProviderConnectionPoint.cs
- LogConverter.cs
- MessageBuffer.cs
- ListControlConvertEventArgs.cs
- LambdaCompiler.Binary.cs
- EmptyQuery.cs
- FieldAccessException.cs
- CompilationRelaxations.cs
- HtmlInputSubmit.cs
- PageContent.cs
- DetailsViewRowCollection.cs
- MissingSatelliteAssemblyException.cs
- _RegBlobWebProxyDataBuilder.cs